'Fragile' Britney acts again

Actor Neil Patrick Harris is raving about Britney Spears' return to acting - even though the pop star refused to take off her sunglasses for an in-studio read-through.

Spears is playing a secretary opposite Harris in an upcoming episode of U.S. TV sitcom How I Met Your Mother - and the actor was impressed with the troubled Toxic singer's professionalism when it came time to act.